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From: Kip Macy <kmacy@FreeBSD.org>
Date: Sun, 24 May 2009 03:49:07 +0000 (UTC)
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Cc: 
Subject: svn commit: r192676 -
	user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
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Author: kmacy
Date: Sun May 24 03:49:07 2009
New Revision: 192676
URL: http://svn.freebsd.org/changeset/base/192676

Log:
  try allowing the arc to grow while still permitting backpressure

Modified:
  user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c

Modified: user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
==============================================================================
--- user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c	Sun May 24 03:22:49 2009	(r192675)
+++ user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c	Sun May 24 03:49:07 2009	(r192676)
@@ -1822,14 +1822,15 @@ arc_reclaim_needed(void)
 #ifdef _KERNEL
 	if (needfree)
 		return (1);
-
+	if (arc_size > arc_c_max)
+		return (1);
 	if (arc_size <= arc_c_min)
 		return (0);
 	/*
 	 * If pages are needed and we're using more than half
 	 * of kmem ... be charitable
 	 */
-	if (vm_pages_needed && (arc_size > kmem_size()/2))
+	if (vm_pages_needed && (arc_size > (kmem_size()*2)/3))
 		return (1);
 
 #if 0
@@ -3431,8 +3432,14 @@ arc_init(void)
 	/* Convert seconds to clock ticks */
 	arc_min_prefetch_lifespan = 1 * hz;
 
+#ifdef __amd64__
+	/* Start out with 1/8 of all memory */
+	arc_c = (physmem*PAGE_SIZE) / 8;
+
+#else
 	/* Start out with 1/8 of all memory */
 	arc_c = kmem_size() / 8;
+#endif
 #if 0
 #ifdef _KERNEL
 	/*